Email

Hello All,
How do I send email via the ISS.
73s Brian N4BAF
----- Original Message -----
From: "Bob Bruninga" <bruninga@usna.edu>
Cc: <sarex@AMSAT.Org>
Sent: Tuesday, September 25, 2001 12:38 PM
Subject: Re: [sarex] ISS Unproto Destination Address
> On Tue, 25 Sep 2001, Stan Vandiver wrote about my suggestion that users
> wanting their packets to be seen by everyone should use "CQ" as a tocall:
>
> > If you want to rewrite the code, I would suggest removing the header
> > filter instead. APRS brought on this "problem"... by design. You can
> > make it better for the future, in my opinion at least, by making it
> > "freestyle friendly" in future revisions.
>
> The TOCALL in APRS is just like any other destination address in any other
> comunication system. If you want everyone to see your transmissions, then
> use an ALL-CALL address of which there are many (CQ, QST, ALL, etc...)...
> If you only want it seen by one person or a subset, then use another
> callsign, or group callsign..
>
> The TOCALL filter that you suggest be abandoned is fundamental to the
> flexibility of APRS operations using the tremendous single frequency APRS
> infrastructure worldwide.
>
> Everyone can use the same digipeaters, the same Igates, and the same
> satellites and a single worldwide internet distribution channel for their
> own purposes because of the front-end TOCALL filters. WIthout the filters
> they would have to contend with thousands of packets per hour, instead of
> the few they might be actually interested in.
>
> If they want their packets to ONLY go to everyone working their
> Marathon and not be bothered by any of the hundreds of other users on
> channel, then they should set their TOCALL to RACE or some other
> mutually agreed SUBNET. If you only want your packets to go to AMSAT,
> then address them to AMSAT. But then you must tell others to open their
> filter to AMSAT, or otherwise, it wont go to them.
>
> With hundreds of users in any area all using the same frequency for APRS,
> the presence of the front-end TOCALL filter is fundamental to APRS
> operation to serve a variety of users, applications, and subnets while
> ignoring everyone else on channel.
>
> Thus the TOCALL of a packet should address who the packet is TO. If it is
> to ALL, then the ham radio typical calls of ALL, CQ and QST were built
> into APRS for that purpose. If you send a packet to BARRY, then in
> accordance with the definiition of the AX.25 TOCALL, one would probably
> conclude that the packet was intended for only one station named BARRY
> or all stations with the group callsign of BARRY...
>
> > If you want to rewrite the code, I would suggest removing the header
> > filter instead. APRS brought on this "problem"... by design.
>
> Yes, it was by design. And I hope you can now see that there is value in
> using the TOCALL of a packet as an address and why this is not really a
> "problem"...
>
> Hope that helps
>
> Bob
>
>
>
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